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PXA: Rework start.S to be closer to other ARMs

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The start.S on PXA was very obscure. This reworks it back to be close to arm1136
start.S and others.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>

V2: Don't compile in relocation support if building SPL
This commit is contained in:
Marek Vasut 2011-10-31 14:12:39 +01:00 committed by Albert ARIBAUD
parent c477d72c04
commit 20f7b1b745
2 changed files with 154 additions and 248 deletions
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16
arch/arm/cpu/pxa/cpu.c
View File

@ -328,3 +328,19 @@ void i2c_clk_enable(void)
writel(readl(CKEN) | CKEN14_I2C, CKEN);
#endif
}
void reset_cpu(ulong ignored) __attribute__((noreturn));
void reset_cpu(ulong ignored)
{
uint32_t tmp;
setbits_le32(OWER, OWER_WME);
tmp = readl(OSCR);
tmp += 0x1000;
writel(tmp, OSMR3);
for (;;)
;
}

386
arch/arm/cpu/pxa/start.S
View File

@ -1,14 +1,20 @@
/*
* armboot - Startup Code for XScale
* armboot - Startup Code for XScale CPU-core
*
* Copyright (C) 1998 Dan Malek <dmalek@jlc.net>
* Copyright (C) 1999 Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
* Copyright (C) 2000 Wolfgang Denk <wd@denx.de>
* Copyright (C) 2001 Alex Zuepke <azu@sysgo.de>
* Copyright (C) 2001 Marius Groger <mag@sysgo.de>
* Copyright (C) 2002 Alex Zupke <azu@sysgo.de>
* Copyright (C) 2002 Gary Jennejohn <garyj@denx.de>
* Copyright (C) 2002 Kyle Harris <kharris@nexus-tech.net>
* Copyright (C) 2003 Robert Schwebel <r.schwebel@pengutronix.de>
* Copyright (C) 2003 Kai-Uwe Bloem <kai-uwe.bloem@auerswald.de>
* Copyright (c) 2010 Marek Vasut <marek.vasut@gmail.com>
* Copyright (C) 2003 Kshitij <kshitij@ti.com>
* Copyright (C) 2003 Richard Woodruff <r-woodruff2@ti.com>
* Copyright (C) 2003 Robert Schwebel <r.schwebel@pengutronix.de>
* Copyright (C) 2004 Texas Instruments <r-woodruff2@ti.com>
* Copyright (C) 2010 Marek Vasut <marek.vasut@gmail.com>
*
* See file CREDITS for list of people who contributed to this
* project.
@ -32,15 +38,6 @@
#include <asm-offsets.h>
#include <config.h>
#include <version.h>
#include <asm/arch/pxa-regs.h>
/* takes care the CP15 update has taken place */
.macro CPWAIT reg
mrc p15,0,\reg,c2,c0,0
mov \reg,\reg
sub pc,pc,#4
.endm
.globl _start
_start: b reset
#ifdef CONFIG_SPL_BUILD
@ -77,26 +74,38 @@ _data_abort: .word data_abort
_not_used: .word not_used
_irq: .word irq
_fiq: .word fiq
_pad: .word 0x12345678 /* now 16*4=64 */
#endif /* CONFIG_SPL_BUILD */
.global _end_vect
_end_vect:
.balignl 16,0xdeadbeef
/*
*************************************************************************
*
* Startup Code (reset vector)
*
* do important init only if we don't start from RAM!
* - relocate armboot to RAM
* - setup stack
* - jump to second stage
* do important init only if we don't start from memory!
* setup Memory and board specific bits prior to relocation.
* relocate armboot to ram
* setup stack
*
*************************************************************************
*/
.globl _TEXT_BASE
_TEXT_BASE:
#ifdef CONFIG_SPL_BUILD
.word CONFIG_SPL_TEXT_BASE
#else
.word CONFIG_SYS_TEXT_BASE
#endif
/*
* These are defined in the board-specific linker script.
* Subtracting _start from them lets the linker put their
* relative position in the executable instead of leaving
* them null.
*/
.globl _bss_start_ofs
_bss_start_ofs:
@ -120,9 +129,8 @@ IRQ_STACK_START:
.globl FIQ_STACK_START
FIQ_STACK_START:
.word 0x0badc0de
#endif /* CONFIG_USE_IRQ */
#endif
#ifndef CONFIG_SPL_BUILD
/* IRQ stack memory (calculated at run-time) + 8 bytes */
.globl IRQ_STACK_START_IN
IRQ_STACK_START_IN:
@ -141,95 +149,19 @@ reset:
orr r0,r0,#0xd3
msr cpsr,r0
/*
* Enable MMU to use DCache as DRAM
*/
/* Domain access -- enable for all CPs */
ldr r0, =0x0000ffff
mcr p15, 0, r0, c3, c0, 0
/* Point TTBR to MMU table */
ldr r0, =mmu_table
adr r2, _start
orr r0, r2
mcr p15, 0, r0, c2, c0, 0
/* !!! Hereby, check if the code is running from SRAM !!! */
/* If the code is running from SRAM, alias SRAM to 0x0 to simulate NOR. The code
* is linked to 0x0 too, so this makes things easier. */
cmp r2, #0x5c000000
ldreq r1, [r0]
orreq r1, r2
streq r1, [r0]
/* Kick in MMU, ICache, DCache, BTB */
mrc p15, 0, r0, c1, c0, 0
bic r0, #0x1b00
bic r0, #0x0087
orr r0, #0x1800
orr r0, #0x0005
mcr p15, 0, r0, c1, c0, 0
CPWAIT r0
/* Unlock Icache, Dcache */
mcr p15, 0, r0, c9, c1, 1
mcr p15, 0, r0, c9, c2, 1
/* Flush Icache, Dcache, BTB */
mcr p15, 0, r0, c7, c7, 0
/* Unlock I-TLB, D-TLB */
mcr p15, 0, r0, c10, c4, 1
mcr p15, 0, r0, c10, c8, 1
/* Flush TLB */
mcr p15, 0, r0, c8, c7, 0
/* Allocate 4096 bytes of Dcache as RAM */
/* Drain pending loads and stores */
mcr p15, 0, r0, c7, c10, 4
mov r4, #0x00
mov r5, #0x00
mov r2, #0x01
mcr p15, 0, r0, c9, c2, 0
CPWAIT r0
/* 128 lines reserved (128 x 32bytes = 4096 bytes total) */
mov r0, #128
mov r1, #0xa0000000
alloc:
mcr p15, 0, r1, c7, c2, 5
/* Drain pending loads and stores */
mcr p15, 0, r0, c7, c10, 4
strd r4, [r1], #8
strd r4, [r1], #8
strd r4, [r1], #8
strd r4, [r1], #8
subs r0, #0x01
bne alloc
/* Drain pending loads and stores */
mcr p15, 0, r0, c7, c10, 4
mov r2, #0x00
mcr p15, 0, r2, c9, c2, 0
CPWAIT r0
/* Jump to 0x0 ( + offset) if running from SRAM */
adr r0, zerojmp
bic r0, #0x5c000000
mov pc, r0
zerojmp:
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
bl cpu_init_crit
#endif
/* Set stackpointer in internal RAM to call board_init_f */
call_board_init_f:
ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
bic sp, sp, #7 /* 8-byte alignment for ABI compliance */
ldr r0,=0x00000000
ldr r0, =0x00000000
bl board_init_f
/*------------------------------------------------------------------------------*/
#ifndef CONFIG_SPL_BUILD
/*
* void relocate_code (addr_sp, gd, addr_moni)
*
@ -254,13 +186,11 @@ stack_setup:
ldr r3, _bss_start_ofs
add r2, r0, r3 /* r2 <- source end address */
stmfd sp!, {r0-r12}
copy_loop:
ldmia r0!, {r3-r5, r7-r11} /* copy from source address [r0] */
stmia r1!, {r3-r5, r7-r11} /* copy to target address [r1] */
ldmia r0!, {r9-r10} /* copy from source address [r0] */
stmia r1!, {r9-r10} /* copy to target address [r1] */
cmp r0, r2 /* until source end address [r2] */
blo copy_loop
ldmfd sp!, {r0-r12}
#ifndef CONFIG_SPL_BUILD
/*
@ -275,13 +205,13 @@ copy_loop:
ldr r3, _rel_dyn_end_ofs /* r3 <- rel dyn end ofs */
add r3, r3, r0 /* r3 <- rel dyn end in FLASH */
fixloop:
ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */
add r0, r9 /* r0 <- location to fix up in RAM */
ldr r0, [r2] /* r0 <- location to fix up, IN FLASH! */
add r0, r0, r9 /* r0 <- location to fix up in RAM */
ldr r1, [r2, #4]
and r7, r1, #0xff
cmp r7, #23 /* relative fixup? */
cmp r7, #23 /* relative fixup? */
beq fixrel
cmp r7, #2 /* absolute fixup? */
cmp r7, #2 /* absolute fixup? */
beq fixabs
/* ignore unknown type of fixup */
b fixnext
@ -298,10 +228,10 @@ fixrel:
add r1, r1, r9
fixnext:
str r1, [r0]
add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
add r2, r2, #8 /* each rel.dyn entry is 8 bytes */
cmp r2, r3
blo fixloop
#endif /* #ifndef CONFIG_SPL_BUILD */
#endif
clear_bss:
#ifndef CONFIG_SPL_BUILD
@ -322,15 +252,16 @@ clbss_l:str r2, [r0] /* clear loop... */
* We are done. Do not return, instead branch to second part of board
* initialization, now running from RAM.
*/
#ifdef CONFIG_ONENAND_IPL
ldr r0, _start_oneboot_ofs
#ifdef CONFIG_ONENAND_SPL
ldr r0, _onenand_boot_ofs
mov pc, r0
_start_oneboot_ofs
: .word start_oneboot
_onenand_boot_ofs:
.word onenand_boot
#else
jump_2_ram:
ldr r0, _board_init_r_ofs
adr r1, _start
ldr r1, _TEXT_BASE
add lr, r0, r1
add lr, lr, r9
/* setup parameters for board_init_r */
@ -341,7 +272,7 @@ _start_oneboot_ofs
_board_init_r_ofs:
.word board_init_r - _start
#endif /* CONFIG_ONENAND_IPL */
#endif
_rel_dyn_start_ofs:
.word __rel_dyn_start - _start
@ -349,43 +280,50 @@ _rel_dyn_end_ofs:
.word __rel_dyn_end - _start
_dynsym_start_ofs:
.word __dynsym_start - _start
#else /* CONFIG_SPL_BUILD */
/****************************************************************************/
/* */
/* the actual reset code for OneNAND IPL */
/* */
/****************************************************************************/
#ifndef CONFIG_PXA27X
#error OneNAND IPL is not supported on PXA25x and 26x due to lack of SRAM
#endif
/*
*************************************************************************
*
* CPU_init_critical registers
*
* setup important registers
* setup memory timing
*
*************************************************************************
*/
#ifndef CONFIG_SKIP_LOWLEVEL_INIT
cpu_init_crit:
/*
* flush v4 I/D caches
*/
mov r0, #0
mcr p15, 0, r0, c7, c7, 0 /* Invalidate I+D+BTB caches */
mcr p15, 0, r0, c8, c7, 0 /* Invalidate Unified TLB */
reset:
/* Set CPU to SVC32 mode */
mrs r0,cpsr
bic r0,r0,#0x1f
orr r0,r0,#0x13
msr cpsr,r0
/*
* disable MMU stuff and caches
*/
mrc p15, 0, r0, c1, c0, 0
bic r0, r0, #0x00002300 @ clear bits 13, 9:8 (--V- --RS)
bic r0, r0, #0x00000087 @ clear bits 7, 2:0 (B--- -CAM)
orr r0, r0, #0x00000002 @ set bit 2 (A) Align
orr r0, r0, #0x00001000 @ set bit 12 (I) I-Cache
mcr p15, 0, r0, c1, c0, 0
/* Point stack at the end of SRAM and leave 32 words for abort-stack */
ldr sp, =0x5c03ff80
/* Start OneNAND IPL */
ldr pc, =start_oneboot
#endif /* CONFIG_SPL_BUILD */
mov pc, lr /* back to my caller */
#endif /* CONFIG_SKIP_LOWLEVEL_INIT */
#ifndef CONFIG_SPL_BUILD
/****************************************************************************/
/* */
/* Interrupt handling */
/* */
/****************************************************************************/
/* IRQ stack frame */
/*
*************************************************************************
*
* Interrupt handling
*
*************************************************************************
*/
@
@ IRQ stack frame.
@
#define S_FRAME_SIZE 72
#define S_OLD_R0 68
@ -409,37 +347,36 @@ reset:
#define S_R0 0
#define MODE_SVC 0x13
#define I_BIT 0x80
/* use bad_save_user_regs for abort/prefetch/undef/swi ... */
/*
* use bad_save_user_regs for abort/prefetch/undef/swi ...
* use irq_save_user_regs / irq_restore_user_regs for IRQ/FIQ handling
*/
.macro bad_save_user_regs
sub sp, sp, #S_FRAME_SIZE
stmia sp, {r0 - r12} /* Calling r0-r12 */
add r8, sp, #S_PC
sub sp, sp, #S_FRAME_SIZE @ carve out a frame on current user stack
stmia sp, {r0 - r12} @ Save user registers (now in svc mode) r0-r12
ldr r2, IRQ_STACK_START_IN
ldmia r2, {r2 - r4} /* get pc, cpsr, old_r0 */
add r0, sp, #S_FRAME_SIZE /* restore sp_SVC */
ldr r2, IRQ_STACK_START_IN @ set base 2 words into abort stack
ldmia r2, {r2 - r3} @ get values for "aborted" pc and cpsr (into parm regs)
add r0, sp, #S_FRAME_SIZE @ grab pointer to old stack
add r5, sp, #S_SP
mov r1, lr
stmia r5, {r0 - r4} /* save sp_SVC, lr_SVC, pc, cpsr, old_r */
mov r0, sp
stmia r5, {r0 - r3} @ save sp_SVC, lr_SVC, pc, cpsr
mov r0, sp @ save current stack into r0 (param register)
.endm
/* use irq_save_user_regs / irq_restore_user_regs for */
/* IRQ/FIQ handling */
.macro irq_save_user_regs
sub sp, sp, #S_FRAME_SIZE
stmia sp, {r0 - r12} /* Calling r0-r12 */
add r8, sp, #S_PC
stmdb r8, {sp, lr}^ /* Calling SP, LR */
str lr, [r8, #0] /* Save calling PC */
stmia sp, {r0 - r12} @ Calling r0-r12
add r8, sp, #S_PC @ !!!! R8 NEEDS to be saved !!!! a reserved stack spot would be good.
stmdb r8, {sp, lr}^ @ Calling SP, LR
str lr, [r8, #0] @ Save calling PC
mrs r6, spsr
str r6, [r8, #4] /* Save CPSR */
str r0, [r8, #8] /* Save OLD_R0 */
str r6, [r8, #4] @ Save CPSR
str r0, [r8, #8] @ Save OLD_R0
mov r0, sp
.endm
@ -452,16 +389,28 @@ reset:
.endm
.macro get_bad_stack
ldr r13, IRQ_STACK_START_IN @ setup our mode stack
ldr r13, IRQ_STACK_START_IN @ setup our mode stack (enter in banked mode)
str lr, [r13] @ save caller lr / spsr
mrs lr, spsr
str lr, [r13, #4]
str lr, [r13] @ save caller lr in position 0 of saved stack
mrs lr, spsr @ get the spsr
str lr, [r13, #4] @ save spsr in position 1 of saved stack
mov r13, #MODE_SVC @ prepare SVC-Mode
msr spsr_c, r13
mov lr, pc
movs pc, lr
@ msr spsr_c, r13
msr spsr, r13 @ switch modes, make sure moves will execute
mov lr, pc @ capture return pc
movs pc, lr @ jump to next instruction & switch modes.
.endm
.macro get_bad_stack_swi
sub r13, r13, #4 @ space on current stack for scratch reg.
str r0, [r13] @ save R0's value.
ldr r0, IRQ_STACK_START_IN @ get data regions start
str lr, [r0] @ save caller lr in position 0 of saved stack
mrs r0, spsr @ get the spsr
str lr, [r0, #4] @ save spsr in position 1 of saved stack
ldr r0, [r13] @ restore r0
add r13, r13, #4 @ pop stack entry
.endm
.macro get_irq_stack @ setup IRQ stack
@ -471,21 +420,17 @@ reset:
.macro get_fiq_stack @ setup FIQ stack
ldr sp, FIQ_STACK_START
.endm
#endif /* CONFIG_SPL_BUILD
/****************************************************************************/
/* */
/* exception handlers */
/* */
/****************************************************************************/
#endif /* CONFIG_SPL_BUILD */
/*
* exception handlers
*/
#ifdef CONFIG_SPL_BUILD
.align 5
do_hang:
ldr sp, _TEXT_BASE /* use 32 words abort stack */
ldr sp, _TEXT_BASE /* use 32 words about stack */
bl hang /* hang and never return */
#else
#else /* !CONFIG_SPL_BUILD */
.align 5
undefined_instruction:
get_bad_stack
@ -494,7 +439,7 @@ undefined_instruction:
.align 5
software_interrupt:
get_bad_stack
get_bad_stack_swi
bad_save_user_regs
bl do_software_interrupt
@ -528,11 +473,12 @@ irq:
.align 5
fiq:
get_fiq_stack
irq_save_user_regs /* someone ought to write a more */
bl do_fiq /* effiction fiq_save_user_regs */
/* someone ought to write a more effiction fiq_save_user_regs */
irq_save_user_regs
bl do_fiq
irq_restore_user_regs
#else /* !CONFIG_USE_IRQ */
#else
.align 5
irq:
@ -545,63 +491,7 @@ fiq:
get_bad_stack
bad_save_user_regs
bl do_fiq
#endif /* CONFIG_SPL_BUILD */
#endif /* CONFIG_USE_IRQ */
/****************************************************************************/
/* */
/* Reset function: the PXA250 doesn't have a reset function, so we have to */
/* perform a watchdog timeout for a soft reset. */
/* */
/****************************************************************************/
/* Operating System Timer */
.align 5
.globl reset_cpu
/* FIXME: this code is PXA250 specific. How is this handled on */
/* other XScale processors? */
reset_cpu:
/* We set OWE:WME (watchdog enable) and wait until timeout happens */
ldr r0, =OWER
ldr r1, [r0]
orr r1, r1, #0x0001 /* bit0: WME */
str r1, [r0]
/* OS timer does only wrap every 1165 seconds, so we have to set */
/* the match register as well. */
ldr r0, =OSCR
ldr r1, [r0] /* read OS timer */
add r1, r1, #0x800 /* let OSMR3 match after */
add r1, r1, #0x800 /* 4096*(1/3.6864MHz)=1ms */
ldr r0, =OSMR3
str r1, [r0]
reset_endless:
b reset_endless
#ifndef CONFIG_SPL_BUILD
.section .mmudata, "a"
.align 14
.globl mmu_table
mmu_table:
/* 0x00000000 - 0xa0000000 : 1:1, uncached mapping */
.set __base, 0
.rept 0xa00
.word (__base << 20) | 0xc12
.set __base, __base + 1
.endr
/* 0xa0000000 - 0xa0100000 : 1:1, cached mapping */
.word (0xa00 << 20) | 0x1c1e
.set __base, 0xa01
.rept 0x1000 - 0xa01
.word (__base << 20) | 0xc12
.set __base, __base + 1
.endr
#endif
.align 5
#endif /* CONFIG_SPL_BUILD */